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KEDIRI, EAST JAVA, INDONESIA - JUNE 09: Students learn Islamic scriptures on the roof top in the islamic boarding school Lirboyo during the holy month of Ramadan on June 9, 2016 in Kediri, East Java, Indonesia. The Islamic boarding school, Lirboyo, was founded by KH Abdul Karim in 1910, and known to be one of the largest traditional "Pesantren" in Indonesia, with around 17,000 students in Kediri, East Java. Students at the Pesantren, also known as "Santri", are separated from their families and spend their days studying Islamic scriptures, reading the Quran and learning Arabic in addition to other activities which begins with the morning prayer at 4am till midnight. (Photo by Ulet Ifansasti/Getty Images)